--- src/pwl.c
+++ src/pwl.c
@@ -54,14 +54,24 @@
 
 #include "config.h"
 
+#define _DEFAULT_SOURCE 1
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/types.h>
 #include <sys/stat.h>
-#include <sys/file.h>
 #include <fcntl.h>
 
+#if defined _WIN32
+# include <io.h>
+# include <Windows.h>
+#elif defined HAVE_FLOCK
+# include <sys/file.h>
+#else
+# include <unistd.h>
+#endif
+
 #include <glib.h>
 #include <glib/gstdio.h>
 #include "enchant-provider.h"
@@ -182,8 +192,69 @@
 
 static int edit_dist(const char* word1, const char* word2);
 
-#define enchant_lock_file(f) flock (fileno (f), LOCK_EX)
-#define enchant_unlock_file(f) flock (fileno (f), LOCK_UN)
+static void enchant_lock_file(FILE * f)
+{
+#if defined _WIN32
+  const DWORD all_bits = ~(DWORD)0;
+  int descriptor = -1;
+  HANDLE handle = INVALID_HANDLE_VALUE;
+  OVERLAPPED overlapped = {0};
+
+  if ((descriptor = _fileno (f)) == -1)
+    goto warning;
+
+  if ((handle = (HANDLE) _get_osfhandle (descriptor)) == INVALID_HANDLE_VALUE)
+    goto warning;
+
+  if (LockFileEx (handle, LOCKFILE_EXCLUSIVE_LOCK, 0, all_bits, all_bits, &overlapped) == TRUE)
+    return;
+#elif defined HAVE_FLOCK
+  int descriptor = fileno (f);
+
+  if (descriptor != -1 && flock (descriptor, LOCK_EX) == 0)
+    return;
+#else
+  int descriptor = fileno (f);
+
+  if (descriptor != -1 && lockf (descriptor, F_LOCK, 0) == 0)
+    return;
+#endif
+
+warning:
+  g_warning("Could not lock file\n");
+}
+
+static void enchant_unlock_file(FILE * f)
+{
+#if defined _WIN32
+  const DWORD all_bits = ~(DWORD)0;
+  int descriptor = -1;
+  HANDLE handle = INVALID_HANDLE_VALUE;
+  OVERLAPPED overlapped = {0};
+
+  if ((descriptor = _fileno (f)) == -1)
+    goto warning;
+
+  if ((handle = (HANDLE) _get_osfhandle (descriptor)) == INVALID_HANDLE_VALUE)
+    goto warning;
+
+  if (UnlockFileEx (handle, 0, all_bits, all_bits, &overlapped))
+    return;
+#elif defined HAVE_FLOCK
+  int descriptor = fileno (f);
+
+  if (descriptor != -1 && flock (descriptor, LOCK_UN) == 0)
+    return;
+#else
+  int descriptor = fileno (f);
+
+  if (descriptor != -1 && lockf (descriptor, F_ULOCK, 0) == 0)
+    return;
+#endif
+
+warning:
+  g_warning("Could not unlock file\n");
+}
 
 /**
  * enchant_pwl_init